Patent GB-1171702-A (GB)
Title: Improvements in Calculating Mechanisms for Calculating Machines
IPC: G06C15/00
Filed: 1967-03-22
Abstract: 1,171,702. Mechanical calculating apparatus; transfer mechanism. SPERRY RAND CORP. 22 March, 1967 [30 March, 1966], No. 13499/67. Headings G4B and G4D. A ten-key calculating machine including a pin carriage 20, totalizer 4, plurality of members 1 for transferring data from the pin carriage to the accumulator, and a transfer mechanism 8, is characterized by the provision of leaf spring members 14 and 9 for transmitting drive to the members 1 and transfer mechanism 8, respectively, and co-operating leaf spring members 6, 7 controlling the transfer mechanism in response to movement of the totalizer wheels; the leaf spring members 6, 7, 9 and 14 being formed as moulded plastic combs. Data entry.-The pin carriage and keyboard are constructed as described in co-pending Specification 1,164,504. Totalizer.-Totalizer wheels 4 are mounted between depending lugs 71 on a frame 70. The latter is movable in horizontal guides under the control of link 19. The frame carries the leaf spring members 6 which co-operate with diametrically opposed widened teeth 4a on the wheels 4. The members 1 are mounted on a shaft 13 and include noses 1a for co-operation with the pin carriage. The members are extended to form inner racks 1b for engagement with the totalizer. Leaf spring members 14 mounted on a shaft 15a rotate the members 1 counter-clockwise. The members 1 are restored to the position illustrated by levers 15. The pin carriage includes a shutter preventing movement of the members 1 to the left of the most significant digit. Transfer mechanism.-The transfer mechanism includes a plurality of segments 8 individually movable on shaft 13. Each segment has a toothed portion 8a, notched portion 8b and slotted portion 8c having a central recess 8d. Leaf spring members 9 mounted on a rotatable shaft 10, engage the notched portions 8b whereby drive is transmitted to the transfer mechanism. The leaf spring members 7 have depending lugs 7b normally engaging the recesses 8d. When a totalizer wheel passes its tens position, a tooth 4a raises the leaf spring member 6, whereby the corresponding leaf spring member 7 is lifted to free a segment 8. For addition, the shaft 10 is first rotated counter clockwise to move the left-hand end of the notch 8c into engagement with the lug 7b The frame 70 is moved horizontally to bring the totalizer into engagement with the toothed portions 8a. The shaft 10 is now rotated clockwise to return the notch 8d into engagement with the lug 7b and add one to the next higher denomination. For subtraction, the shaft 10 is first rotated clockwise then counter-clockwise to subtract one from the next higher denomination. Printing mechanism; zero suppression.-The members 1 include outer racks 1e for setting type bars 2. Hammers 3 are urged towards the type bars by leaf springs 7e. Each hammer is held in position by a latch 18. The latter is pivoted clear of the hammer on movement of the associated member 1. Operation of the hammers is controlled by a rotating cam 17. Each latch engages a pin on the adjacent righthand latch. Hence pivotal movement of a latch to release a hammer is accompanied by a release of all hammers to the right of said hammer. Consequently only the significant zeroes are printed. Symbol printing.-A symbol type bar is provided with a lug 85a at its lower end cooperating with the stepped lower face of a cam 80. The latter is movable under the control of a function key and the pin carriage. Sub-total; total taking.-For sub-total or total taking the pin carriage is cleared, whereby the cam 80 is positioned so that its upper face urges fingers 5 into the path of teeth 4a. The totalizer is positioned in engagement with the racks 1b and members 1 rotated counterclockwise. The amount stored in the totalizer is transferred to the type bars and the totalizer wheels returned to zero with the teeth 4a abutting the fingers 5. The members 1 are returned to their initial positions and the amount reset in the totalizer in the case of subtotal taking. The totalizer is moved clear of the racks 1b, before the return movement of the members 1, during total taking.